Do you know these are visitors coming in via Google search? I think you need to analyze your logs and determine whether these are in fact human visitors, or whether they're bots. It sounds to me like they might be bots.
Conceivably, your message board is built on a platform that might have a vulnerability which rogue bots like to target, and they've found you via a software or template signature of some sort.
For the human visitors, including your locality in your title and on the page might help attract the people you want to visit and discourage some click-throughs from the others.